The first and second (see photo's above) came together with a hole bunch in a package. The bigger ones are quite OK. The pencil-top erasers are too small: when you cut out a bit and push they break easily.
The two stamps above actually are two halves of a thick and large eraser. I consider this the best buy: a big and thick eraser (ca. 8*4*1 cm) for 26 €-cents (nowadays 35 -cents). Nice material, easily cuttable.
These erasers are toys in fact. They don't erase well and crumble to soon. But it's fun that they look like cookies and it's even more fun that they're called 'love erasers.' You can send them to your boy-/girlfriend when you want to quit the relation, I suppose.
I bought another 15 erasers last tuesday and made new eraser-stamps.